<template>
    <div v-if="easyFlowVisible" style="height: calc(100vh);">
        <el-row>
            <!--顶部工具菜单-->
            <el-col :span="24">
                <div class="ef-tooltar">
                    <el-link type="primary" :underline="false">{{data.name}}</el-link>
                    <div style="float: right;margin-right: 5px">
                        <el-button type="primary" plain round  size="small" @click="processCode" >
                            
                            <Document style="width: 1em; height: 1em; margin-right: 8px"/>
                            流程信息
                        </el-button>
                        <!-- <el-button type="primary" plain round @click="dataReloadA"  size="small">切换流程A</el-button>
                        <el-button type="primary" plain round @click="dataReloadB"  size="small">切换流程B</el-button>
                        <el-button type="primary" plain round @click="dataReloadC"  size="small">切换流程C</el-button>
                        <el-button type="primary" plain round @click="dataReloadD" size="small">自定义样式</el-button>
                        <el-button type="primary" plain round @click="dataReloadE" size="small">力导图</el-button> -->
                        <el-button type="info" plain round  @click="openHelp" size="small">帮助</el-button>
                        <el-button type="success" plain round  @click="saveConfigButtonClick" size="small">保存</el-button>
                    </div>
                </div>
            </el-col>
        </el-row>
        <div style="display: flex;height: calc(100% - 47px);">
            <div style="width: 230px;border-right: 1px solid #dce3e8;">
                <node-menu @addNode="addNode" ref="nodeMenu"></node-menu>
            </div>
            <div id="efContainer" ref="efContainer" class="container" v-flowDrag>
                <template v-for="node in data.nodeList" :key="node.id">
                    <flow-node
                        :id="node.id"
                        :node="node"
                        :activeElement="activeElement"
                        @changeNodeSite="changeNodeSite"
                        @nodeRightMenu="nodeRightMenu"
                        @clickNode="clickNode"
                        @contextmenu="showMenu"
                        ref="noderef"
                    >
                    </flow-node>
                </template>
                <!-- 给画布一个默认的宽度和高度 -->
                <div style="position:absolute;top: 2000px;left: 2000px;">&nbsp;</div>
            </div>
            <!-- 右侧表单 -->
            <div style="width: 300px;border-left: 1px solid #dce3e8;background-color: #FBFBFB">
                <flow-node-form ref="nodeForm" @setLineLabel="setLineLabel" @repaintEverything="repaintEverything"></flow-node-form>
            </div>
        </div>
        <!-- 流程数据详情 -->
        <flow-info v-if="flowInfoVisible" ref="flowInfo" :data="data"></flow-info>
        <flow-help v-if="flowHelpVisible" ref="flowHelp"></flow-help>
    </div>

</template>

<script>
    import { CustomMouseMenu } from '@howdyjs/mouse-menu';
    import './modules/index.css'
    import './utils/jsplumb'
    import { easyFlowMixin } from './utils/mixins.js'
    import { getConfigByProcessId,saveConfig } from './config.js'
    import flowNode from './modules/node.vue'
    import nodeMenu from './modules/node_menu.vue'
    import FlowInfo from './modules/info.vue'
    import FlowHelp from './modules/help.vue'
    import FlowNodeForm from './modules/node_form.vue'
    import lodash from 'lodash'
    import { ForceDirected } from './utils/force-directed'
    import { View, Document, Search, RefreshLeft, Printer ,Right} from '@element-plus/icons-vue'
    
    export default {
        props: {
            processId: String,
        },
        components: {
             flowNode, nodeMenu, FlowInfo, FlowNodeForm, FlowHelp,Document
        },
        data() {
            return {
                // jsPlumb 实例
                jsPlumb: null,
                // 控制画布销毁
                easyFlowVisible: true,
                // 控制流程数据显示与隐藏
                flowInfoVisible: false,
                // 是否加载完毕标志位
                loadEasyFlowFinish: false,
                flowHelpVisible: false,
                // 数据(包含name,nodeList,lineList)
                data: {},
                // 激活的元素、可能是节点、可能是连线
                activeElement: {
                    // 可选值 node 、line
                    type: undefined,
                    // 节点ID
                    nodeId: undefined,
                    // 连线ID
                    sourceId: undefined,
                    targetId: undefined
                },
                zoom: 0.5
            }
        },
        // 一些基础配置移动该文件中
        mixins: [easyFlowMixin],
        components: {
             flowNode, nodeMenu, FlowInfo, FlowNodeForm, FlowHelp
        },
        directives: {
            'flowDrag': {
                mounted(el, binding, vnode, oldNode) {
                    if (!binding) {
                        return
                    }
                    el.onmousedown = (e) => {//对该自定义指令关联的dom做监听鼠标的事件
                        if (e.button == 2) {
                            // 右键不管
                            return
                        }
                        //  鼠标按下，计算当前原始距离可视区的高度
                        let disX = e.clientX//鼠标距离最左边的px
                        let disY = e.clientY
                        el.style.cursor = 'move'//鼠标变成菱形
                        document.onmousemove = function (e) {
                            // 移动时禁止默认事件
                            e.preventDefault()
                            const left = e.clientX - disX
                            disX = e.clientX
                            el.scrollLeft += -left

                            const top = e.clientY - disY
                            disY = e.clientY
                            el.scrollTop += -top
                        }

                        document.onmouseup = function (e) {
                            el.style.cursor = 'auto'//鼠标恢复原样
                            document.onmousemove = null
                            document.onmouseup = null
                        }
                    }
                }
            }
        },
        async mounted() {
            //如果传了processId,那么从数据库中获取流程数据
            let config = {} // 定义一个空对象 config
            if (this.processId) { // 如果 this.processId 存在
                config = await getConfigByProcessId(this.processId) // 调用异步函数 getConfigByProcessId，将返回值赋给 config
                if(!config){ // 如果 config 不存在
                    return this.$message.error('流程不存在,无法编辑!') // 显示错误提示消息
                }
            }
            this.jsPlumb = jsPlumb.getInstance() // 实例化 jsPlumb 对象
            this.$nextTick(() => {
                // 如果都没有left top信息,那么生成力道图
                if(config.nodeList.filter(item=>item.left || item.top).length == 0 ){ // 如果 config.nodeList 数组中所有元素都没有 left 或 top 属性
                    let data = ForceDirected(config) // 调用 ForceDirected 函数，将 config 作为参数传入，并将返回值赋给 data
                }
                this.dataReload(config) // 调用 dataReload 方法，将 config 作为参数传入，用于加载流程数据
            })
        },
        methods: {
            //鼠标右键事件
            showMenu(e){
                //将该节点的信息放在右边,并且展示删除按钮
                e.preventDefault()
                let nodeId = e.currentTarget.id
                this.clickNode(nodeId)
                const MouseMenuCtx = CustomMouseMenu({
                    el: this.$refs.noderef.value,
                    menuList: [
                    {
                        label: '删除',
                        fn: (params, currentEl, bindingEl, e) => {
                            this.deleteElement()
                        }
                    }
                ]
                })
                const { x, y } = e;
                MouseMenuCtx.show(x,y);
            },
            clickNode(nodeId) {//将该节点的信息放在右边(作为激活),
                this.activeElement.type = 'node'
                this.activeElement.nodeId = nodeId
                this.$refs.nodeForm.nodeInit(this.data, nodeId)//将node或者line信息放到右边的组件里
            },
            saveConfigButtonClick(){
                saveConfig(this.data).then(res=>{
                    if(res.code==200){
                        this.$message.success('保存成功')
                    }else{
                        this.$message.error(res.msg)
                    }
                })
            },
            // 加载流程图
            dataReload(data) {
                this.easyFlowVisible = false
                this.data.nodeList = []
                this.data.lineList = []
                this.$nextTick(() => {
                    data = lodash.cloneDeep(data)
                    this.easyFlowVisible = true
                    this.data = data
                    this.$nextTick(() => {
                        this.jsPlumb = jsPlumb.getInstance()
                        this.$nextTick(() => {
                            this.jsPlumbInit()//初始化jsplumb工具
                        })
                    })
                })
            },
            // 返回唯一标识
            getUUID() {
                return Math.random().toString(36).substr(3, 10)
            },
            jsPlumbInit() {
                this.jsPlumb.ready(() => {
                    // 导入默认配置
                    this.jsPlumb.importDefaults(this.jsplumbSetting)
                    // 会使整个jsPlumb立即重绘。
                    this.jsPlumb.setSuspendDrawing(false, true);
                    // 初始化节点
                    this.loadEasyFlow()
                    // 单点击了连接线, https://www.cnblogs.com/ysx215/p/7615677.html
                    this.jsPlumb.bind('click', (conn, originalEvent) => {
                        this.activeElement.type = 'line'
                        this.activeElement.sourceId = conn.sourceId
                        this.activeElement.targetId = conn.targetId
                        let conditiontype = ''
                        let conditionvalue = ''
                        this.data.lineList.forEach(line=>{
                            if(line.from == conn.sourceId && line.to == conn.targetId){
                                conditiontype = line.conditiontype
                                conditionvalue = line.conditionvalue
                            }
                        })
                        this.$refs.nodeForm.lineInit({
                            from: conn.sourceId,
                            to: conn.targetId,
                            label: conn.getLabel(),
                            conditiontype,
                            conditionvalue
                        },this.data)
                    })
                    this.jsPlumb.bind('contextmenu', (conn, originalEvent) => {
                        this.activeElement.type = 'line'
                        this.activeElement.sourceId = conn.sourceId
                        this.activeElement.targetId = conn.targetId
                        this.$refs.nodeForm.lineInit({
                            from: conn.sourceId,
                            to: conn.targetId,
                            label: conn.getLabel()
                        },this.data)
                        originalEvent.preventDefault()
                        const MouseMenuCtx = CustomMouseMenu({
                            menuList: [
                            {
                                label: '删除',
                                fn: (params, currentEl, bindingEl, e) => {
                                    this.deleteElement()
                                }
                            }
                        ]
                        })
                        const { x, y } = originalEvent;
                        MouseMenuCtx.show(x,y);

                    })
                    // 连线
                    this.jsPlumb.bind("connection", (evt) => {
                        let from = evt.source.id
                        let to = evt.target.id
                        if (this.loadEasyFlowFinish) {
                            this.data.lineList.push({from: from, to: to})
                        }
                    })

                    // 删除连线回调
                    this.jsPlumb.bind("connectionDetached", (evt) => {
                        this.deleteLine(evt.sourceId, evt.targetId)
                    })

                    // 改变线的连接节点
                    this.jsPlumb.bind("connectionMoved", (evt) => {
                        this.changeLine(evt.originalSourceId, evt.originalTargetId)
                    })

                    // 连线右击
                    this.jsPlumb.bind("contextmenu", (evt) => {
                        console.log('contextmenu', evt)
                    })

                    // 连线
                    this.jsPlumb.bind("beforeDrop", (evt) => {
                        let from = evt.sourceId
                        let to = evt.targetId
                        if (from === to) {
                            this.$message.error('节点不支持连接自己')
                            return false
                        }
                        if (this.hasLine(from, to)) {
                            this.$message.error('该关系已存在,不允许重复创建')
                            return false
                        }
                        if (this.hashOppositeLine(from, to)) {
                            this.$message.error('不支持两个节点之间连线回环');
                            return false
                        }
                        this.$message.success('连接成功')
                        return true
                    })

                    // beforeDetach
                    this.jsPlumb.bind("beforeDetach", (evt) => {
                        console.log('beforeDetach', evt)
                    })
                    this.jsPlumb.setContainer(this.$refs.efContainer)
                })
            },
            // 加载流程图
            loadEasyFlow() {
                // 初始化节点
                for (var i = 0; i < this.data.nodeList.length; i++) {
                    let node = this.data.nodeList[i]
                    // 设置源点，可以拖出线连接其他节点
                    this.jsPlumb.makeSource(node.id, lodash.merge(this.jsplumbSourceOptions, {}))
                    // // 设置目标点，其他源点拖出的线可以连接该节点
                    this.jsPlumb.makeTarget(node.id, this.jsplumbTargetOptions)
                    if (!node.viewOnly) {
                        this.jsPlumb.draggable(node.id, {
                            containment: 'parent',
                            stop: function (el) {
                                // 拖拽节点结束后的对调
                                console.log('拖拽结束: ', el)
                            }
                        })
                    }
                }
                // 初始化连线
                for (var i = 0; i < this.data.lineList.length; i++) {
                    let line = this.data.lineList[i]
                    var connParam = {
                        source: line.from,
                        target: line.to,
                        label: line.label ? line.label : '',
                        connector: line.connector ? line.connector : '',
                        anchors: line.anchors ? line.anchors : undefined,
                        paintStyle: line.paintStyle ? line.paintStyle : undefined,
                    }
                    this.jsPlumb.connect(connParam, this.jsplumbConnectOptions)
                }
                this.$nextTick(function () {
                    this.loadEasyFlowFinish = true
                })
            },
            // 设置连线条件
            setLineLabel(from, to, label,conditiontype,conditionvalue) {
                var conn = this.jsPlumb.getConnections({
                    source: from,
                    target: to
                })[0]
                if (!label || label === '') {
                    conn.removeClass('flowLabel')
                    conn.addClass('emptyFlowLabel')
                } else {
                    conn.addClass('flowLabel')
                }
                conn.setLabel({
                    label: label,
                })
                this.data.lineList.forEach(function (line) {
                    if (line.from == from && line.to == to) {
                        line.label = label,
                        line.conditiontype = conditiontype,
                        line.conditionvalue = conditionvalue
                    }
                })

            },
            // 删除激活的元素
            deleteElement() {
                if (this.activeElement.type === 'node') {
                    this.deleteNode(this.activeElement.nodeId)
                } else if (this.activeElement.type === 'line') {
                    this.$confirm('确定删除所点击的线吗?', '提示', {
                        confirmButtonText: '确定',
                        cancelButtonText: '取消',
                        type: 'warning'
                    }).then(() => {
                        var conn = this.jsPlumb.getConnections({
                            source: this.activeElement.sourceId,
                            target: this.activeElement.targetId
                        })[0]
                        this.jsPlumb.deleteConnection(conn)
                    }).catch(() => {
                    })
                }
            },
            // 删除线
            deleteLine(from, to) {
                this.data.lineList = this.data.lineList.filter(function (line) {
                    if (line.from == from && line.to == to) {
                        return false
                    }
                    return true
                })
            },
            // 改变连线
            changeLine(oldFrom, oldTo) {
                this.deleteLine(oldFrom, oldTo)
            },
            // 改变节点的位置
            changeNodeSite(data) {
                for (var i = 0; i < this.data.nodeList.length; i++) {
                    let node = this.data.nodeList[i]
                    if (node.id === data.nodeId) {
                        node.left = data.left
                        node.top = data.top
                    }
                }
            },
            /**
             * 拖拽结束后添加新的节点
             * @param evt
             * @param nodeMenu 被添加的节点对象
             * @param mousePosition 鼠标拖拽结束的坐标
             */
            addNode(evt, nodeMenu, mousePosition) {
                debugger
                var screenX = evt.originalEvent.clientX, screenY = evt.originalEvent.clientY//拖到哪里了
                let efContainer = this.$refs.efContainer
                var containerRect = efContainer.getBoundingClientRect()
                var left = screenX, top = screenY//left据屏幕最左边的距离
                // 计算是否拖入到容器中
                if (left < containerRect.x || left > containerRect.width + containerRect.x || top < containerRect.y || containerRect.y > containerRect.y + containerRect.height) {
                    return
                }
                left = left - containerRect.x + efContainer.scrollLeft
                top = top - containerRect.y + efContainer.scrollTop
                // 居中
                left -= 85
                top -= 16
                var random = this.getUUID()
                var nodeId = nodeMenu.id+'_'+random
                // 动态生成名字
                var nodeName = nodeMenu.name+'_'+random
                //var nodeName = origName
                // var index = 1
                // while (index < 10000) {
                //     var repeat = false
                //     for (var i = 0; i < this.data.nodeList.length; i++) {
                //         let node = this.data.nodeList[i]
                //         if (node.name === nodeName) {
                //             nodeName = origName + index
                //             repeat = true
                //         }
                //     }
                //     if (repeat) {
                //         index++
                //         continue
                //     }
                //     break
                // }
                var node = {
                    id: nodeId,
                    name: nodeName,
                    type: nodeMenu.name,
                    left: left + 'px',
                    top: top + 'px',
                    ico: nodeMenu.ico,
                    state: 'success'
                }
                /**
                 * 这里可以进行业务判断、是否能够添加该节点
                 */
                this.data.nodeList.push(node)
                this.$nextTick(function () {
                    this.jsPlumb.makeSource(nodeId, this.jsplumbSourceOptions)
                    this.jsPlumb.makeTarget(nodeId, this.jsplumbTargetOptions)
                    this.jsPlumb.draggable(nodeId, {
                        containment: 'parent',
                        stop: function (el) {
                            // 拖拽节点结束后的对调
                            console.log('拖拽结束: ', el)
                        }
                    })
                })
            },
            /**
             * 删除节点
             * @param nodeId 被删除节点的ID
             */
            deleteNode(nodeId) {
                this.$confirm('确定要删除节点' + nodeId + '?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning',
                    closeOnClickModal: false
                }).then(() => {
                    /**
                     * 这里需要进行业务判断，是否可以删除
                     */
                    this.data.nodeList = this.data.nodeList.filter(function (node) {
                        if (node.id === nodeId) {
                            // 伪删除，将节点隐藏，否则会导致位置错位
                            // node.show = false
                            return false
                        }
                        return true
                    })
                    this.$nextTick(function () {
                        this.jsPlumb.removeAllEndpoints(nodeId);
                    })
                }).catch(() => {
                })
                return true
            },
            // 是否具有该线
            hasLine(from, to) {
                for (var i = 0; i < this.data.lineList.length; i++) {
                    var line = this.data.lineList[i]
                    if (line.from === from && line.to === to) {
                        return true
                    }
                }
                return false
            },
            // 是否含有相反的线
            hashOppositeLine(from, to) {
                return this.hasLine(to, from)
            },
            nodeRightMenu(nodeId, evt) {
                this.menu.show = true
                this.menu.curNodeId = nodeId
                this.menu.left = evt.x + 'px'
                this.menu.top = evt.y + 'px'
            },
            repaintEverything() {
                this.jsPlumb.repaint()
            },
            // 流程数据信息
            processCode() {
                debugger
                this.flowInfoVisible = true
                this.$nextTick(function () {
                    console.log(this.$refs.flowInfo)
                    this.$refs.flowInfo.init()
                })
            },
            zoomAdd() {
                if (this.zoom >= 1) {
                    return
                }
                this.zoom = this.zoom + 0.1
                this.$refs.efContainer.style.transform = `scale(${this.zoom})`
                this.jsPlumb.setZoom(this.zoom)
            },
            zoomSub() {
                if (this.zoom <= 0) {
                    return
                }
                this.zoom = this.zoom - 0.1
                this.$refs.efContainer.style.transform = `scale(${this.zoom})`
                this.jsPlumb.setZoom(this.zoom)
            },
            // 下载数据
            downloadData() {
                this.$confirm('确定要下载该流程数据吗？', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning',
                    closeOnClickModal: false
                }).then(() => {
                    var datastr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(this.data, null, '\t'));
                    var downloadAnchorNode = document.createElement('a')
                    downloadAnchorNode.setAttribute("href", datastr);
                    downloadAnchorNode.setAttribute("download", 'data.json')
                    downloadAnchorNode.click();
                    downloadAnchorNode.remove();
                    this.$message.success("正在下载中,请稍后...")
                }).catch(() => {
                })
            },
            openHelp() {
                this.flowHelpVisible = true
                this.$nextTick(function () {
                    this.$refs.flowHelp.init()
                })
            }
        }
    }
</script>
<style scoped>
.__menu__wrapper[data-v-3d21bc0a]{
    width: 84px  !important;
}
</style>